You got it!
As more people start to realize that STEEM "vested" has the best ROI (Return On Investment) compared to other curriencies, there will be more STEEM bought up further reducing the supply. Businesses will join in. Why not, the ROI can be easily 20% with almost no overhead. What business model can provide that? It is a matter of time before people start flooding in and buying up all the STEEM. The liquid supply going down is a clear indication of what is going on.